Head and neck, CT, Radiation safety, Dosimetric comparison
P. P. RAGUCCI1, C. VALTOLINA2, D. D'Angelo1, I. Divenuto1, L. Balzarini2; 1ROZZANO, LO/IT, 2Rozzano/IT
Methods and materials
Twenty patients ( range 32-60 mean age 47) were randomly selected for an ultra-low-dose protocol,
instead of a low-dose protocol.
All patients signed a written informed consent before image acquisition.
Scans were performed with CT GE Revolution EVO 64 slices.
Technical parameters used in the standard low-dose protocol were: 100 kV,
64x0.625 mm slice collimation; while the ultra-low-dose protocol was set as follows: 80 kV,
64x0.312 mm slice collimation. images were recontructed in axial,
coronal and sagittal view,
at 2 mm thichness (axial and coronal) and 1 mm thichness (sagittal).
Radiation exposure was assessed using a dose management software (GE Dosewatch©).
A five-point scale was used to assess image quality (1= non diagnostic quality – 5= excellent quality).
Images were evaluated by a neuroradiologist,
blinded to clinical data,
with 10 years of experience in reading maxillofacial CT.
The evaluation was focused on ethmoid cribrose laminae and ostium - meatali complexes.